The contact information page in the iOS 5 address book has a field not just for Twitter, but also offers space to add friends’ handles on Facebook, Flickr, LinkedIn and Myspace.

Alongside a person’s email address and phone number, an iOS user can also add links to their accounts around the Web. Then Apple auto-populates the URL for each of the services. Clicking on the account name opens up Safari to that person’s profile page.

AllThingsD confirmed the feature’s existence after a developer mentioned it to us. It’s not hidden in the source code or anything, but plain for users of the developer beta to see.

The developer, who asked not to be named, pointed out that the social integrations are a bit buggy. For instance, adding a Myspace handle brings up an unlimited number of fields, and the social fields only come up when you create a new contact. But again, this is a developer release.

The inclusion of the feature shows Apple’s acknowledgement of the importance of Web presences and contact information. But it could be much more useful if users don’t have to enter each of their friends’ handles manually, as appears to be the case at least in this release.

Imagine entering in your credentials and seeing your social network friends and contacts automatically synced and merged with your phone contacts. This will be the case for Twitter when iOS 5 comes out — Apple will even update users contacts’ photos with their Twitter profile pics (a screenshot from the WWDC keynote is below). Apple may well add authentication for other services as well.

Sucking all these contacts up and matching them together to create a sort of Frankenstein social network would not be trivial; Apple would presumably need to match users’ phone numbers, handles, and/or email addresses across various services to disambiguate them.

In addition, Google is also working to compile centralized profiles of users’ social Web contacts through its Google Profiles feature — that’s in fact the issue Facebook tried to expose with a secret smear campaign. Facebook’s PR firm proxy alleged Google was sketchily scraping the Web in order to “compile the data into one massive dossier aligned directly with user’s personally identifiable information.”

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